gallivm/nir: fix big-endian 64-bit splitting/merging.

The shuffles need to be swapped to do this properly on big-endian

Cc: <[email protected]>

Reviewed-by: Roland Scheidegger <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5679>

2 files changed, 20 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_nir.c b/src/gallium/auxiliary/gallivm/lp_bld_nir.c
index f14475e839d..2c4135ccc05 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_nir.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_nir.c
@@ -353,8 +353,13 @@ static LLVMValueRef split_64bit(struct lp_build_nir_context *bld_base,
    LLVMValueRef shuffles2[LP_MAX_VECTOR_WIDTH/32];
    int len = bld_base->base.type.length * 2;
    for (unsigned i = 0; i < bld_base->base.type.length; i++) {
+#if UTIL_ARCH_LITTLE_ENDIAN
       shuffles[i] = lp_build_const_int32(gallivm, i * 2);
       shuffles2[i] = lp_build_const_int32(gallivm, (i * 2) + 1);
+#else
+      shuffles[i] = lp_build_const_int32(gallivm, (i * 2) + 1);
+      shuffles2[i] = lp_build_const_int32(gallivm, (i * 2));
+#endif
    }
 
    src = LLVMBuildBitCast(gallivm->builder, src, LLVMVectorType(LLVMInt32TypeInContext(gallivm->context), len), "");
@@ -378,8 +383,13 @@ merge_64bit(struct lp_build_nir_context *bld_base,
    assert(len <= (2 * (LP_MAX_VECTOR_WIDTH/32)));
 
    for (i = 0; i < bld_base->base.type.length * 2; i+=2) {
+#if UTIL_ARCH_LITTLE_ENDIAN
       shuffles[i] = lp_build_const_int32(gallivm, i / 2);
       shuffles[i + 1] = lp_build_const_int32(gallivm, i / 2 + bld_base->base.type.length);
+#else
+      shuffles[i] = lp_build_const_int32(gallivm, i / 2 + bld_base->base.type.length);
+      shuffles[i + 1] = lp_build_const_int32(gallivm, i / 2);
+#endif
    }
    return LLVMBuildShuffleVector(builder, input, input2, LLVMConstVector(shuffles, len), "");
 }
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_nir_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_nir_soa.c
index 542fd02565c..3cefcdb6614 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_nir_soa.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_nir_soa.c
@@ -69,8 +69,13 @@ emit_fetch_64bit(
    assert(len <= (2 * (LP_MAX_VECTOR_WIDTH/32)));
 
    for (i = 0; i < bld_base->base.type.length * 2; i+=2) {
+#if UTIL_ARCH_LITTLE_ENDIAN
       shuffles[i] = lp_build_const_int32(gallivm, i / 2);
       shuffles[i + 1] = lp_build_const_int32(gallivm, i / 2 + bld_base->base.type.length);
+#else
+      shuffles[i] = lp_build_const_int32(gallivm, i / 2 + bld_base->base.type.length);
+      shuffles[i + 1] = lp_build_const_int32(gallivm, i / 2);
+#endif
    }
    res = LLVMBuildShuffleVector(builder, input, input2, LLVMConstVector(shuffles, len), "");
 
@@ -91,8 +96,13 @@ emit_store_64bit_split(struct lp_build_nir_context *bld_base,
 
    value = LLVMBuildBitCast(gallivm->builder, value, LLVMVectorType(LLVMFloatTypeInContext(gallivm->context), len), "");
    for (i = 0; i < bld_base->base.type.length; i++) {
+#if UTIL_ARCH_LITTLE_ENDIAN
       shuffles[i] = lp_build_const_int32(gallivm, i * 2);
       shuffles2[i] = lp_build_const_int32(gallivm, (i * 2) + 1);
+#else
+      shuffles[i] = lp_build_const_int32(gallivm, i * 2 + 1);
+      shuffles2[i] = lp_build_const_int32(gallivm, i * 2);
+#endif
    }
 
    split_values[0] = LLVMBuildShuffleVector(builder, value,